Thread rolling machine



y 1949. A, E. DRISSNER ETAL 2,475,084

THREAD ROLLING MACHINE Filed April 29, 1944 6 Sheets-Sheet 1 6Sheets-Sheet 2 8% I mm a.. i fl vww a m n u L M... IE w m i I I M i h Nmm m W I F H HHHHIHH 1| I m u l n J m I u b m n p mm July 5, 1949. A. E.DRISSNER ETAL THREAD ROLLING MACHINE F1183 April 29, 1944 aw bu on A. E.DRISSNER El AL. 2,475,084.

THREAD ROLLING MACHINE 6 Sheets-Sheet 3 IN V EN TORS, edl'lDfissl-acn Q.7 v WWW! July 5, 1949.

Filed April 29, 1944 HEEI $710 wqag wf fir Wilma/11L y 1949. A. E.DRISSNER EIAL 2,475,084

THREAD ROLLING MACHINE 7 Filed April 29, 1944 s Sheets-She et 4 i! mgged; mmvroas, fl tam-[Hoqg 3 M fiZ-EEonnerl July 5, 1949.

A. E. DRISSNER ETAL THREAD ROLLING MACHINE 6 Sheets-sheaf. 6

Filed April 29. 1944 IN V EN T0R59 E flilssnen 71 55 150170 PatentedJuly 5, 1949 UNIT-ED s'tAT-Es ow-ice Ohio The presentfin irenti on rlat'esjto thread folliiig ""machinesfaridhas for its pri icipalcb'j'ectthe provision of-animp1 ovedinachirie wherein the very s'atisfac'toffin*the me i tio b ga'ccdrate work and not accurate enough to produce "aSiflobth, accurate Class thread as demanded "today by theAir'Cofpsjoxaeroplaneparts,"wlif- *as, the preserit iirhpi'bvemez t willpot only meet this machihe fto roll thi'eaiis with "a tolerance of .0005in the bitchfdia riete a A 4 W --In the pi'esent iihprovenieht,therefore; an 9]0- 'j ect of the ii lve'rition is the'provisioppf animproved iiiac hifie whereby the t rea rolls are an movecl directly asingle 'rptary da having "a fel e w n; ur s 'o 'i bmim1 h T 11 'trieiebelimi riating' all linkag'es" ahd' intermediate i a 'still furtherobjectof the ihv ri tibn is the prciilision of hydratin opefatihg mechanismfor 'irna'cliine which will accurately "control the "cam action orthebafirslid'eis. l s

A sun further object of the 'breserit ny'em' dn is the ij rovision "-0;mechanism hydfia i lic'ally "opfajt d directly "aLiid uniformly tocontrol the op. 'eration aiid s'fieedbi the follsarid which can beat'ijii sted-to siii t'i'diiiriileiits. v A still further object of theinyentio'h is sim- "b lici fiy df desiih lease of operation together 0with 156 mm ior assuring extreme accuracy, not so far? me on other typesf thread iollirig m'achi es, whichwill eriable ine'iig'jeiie'nced'ob'e'iators to tur'n oiit very accurate w61{k,sbithing very importantwhen iqi aintity production isess'ential ai d skilled l'abor'difliult toobtain. Ih the iiiawi fig s iacoin' oariying a rw ssp. wit F -fuse siesfmma lay-hut of the ox'gerati gpartsof the machirie.

Eig. 2 isa froht View of the machine.

leiiwfi rie l a transverse vertical section taken on m 4-4 of F153;

Rig. 5 is a vertidalsection on line 5-5 of Fig.2. Fig. 6 is a sectionalview similar to that shown 3 ment of the cam, hereinafter described, forshifting the rolls to and from the work.

This shifting unit also comprises a flow control valve [3 similar inconstruction to the valve 9, which valve i3 is provided with a reliefvalve l4 and control gauge [5. From this control valve |3, the fluidasses into a solenoid four-way valve l8 and thence into the cylinder I1for operating the piston I8, all of which will be further described inconnection with the operation of the machine.

The stroke of the piston I8 is limited by a limit switch l9 whichcontrols a time-delay valve 29 through stops 2|. The switch is supportedfor movement with the piston rod 22 attached to the piston l8. Thesestops may be adjusted to limit the stroke of the piston as will be notedhereinafter.

For the convenience of the operator, the machine is provided with afoot-controlled switch 23 so that his hands will be free for loadingpieces and feeding them into the machine. A hand control switch 24 isalso provided,

As hereinbefore mentioned, in the head 3 of the machine is located themotor 1 adapted to rotate the shaft 24' and this motor and shaft arecoupled together by means of the coupling 26 and keys 21. The motor 1 isalso provided with a constant displacement fluid pump for controllingthe rotary movement of the thread rolls and spindles.

On the shaft 24 is located a worm 28 secured for rotation therewith andadapted to engage a worm gear 29 splined to a shaft 30. On this shaft 30is a gear 3| adapted to mesh with a similar gear 32 splined to a shaft33 having secured for rotation therewith at its opposite end a gear 34.The gears 3| and 32 are adapted to be changed when desired, in order tochange the speed of the spindles 8 beyond the limit of the fluid motorIn the present instance, the gear 34 is surrounded by and meshes withthree idler gears 35 mounted on appropriate stud shafts 35' in thehousing (see Figs. 6 and '7). These idler gears are double-ended spurgears, the opposite ends of which are adapted to mesh with and drive thethree spindle gears 36 secured to one end of the spindles 8 which carryon their opposite ends the thread rolls 38.

The ends of the spindles 8 carrying the tool or thread rolls aresupported, in the present instance, in bronze bushings 6|. However,suitable rolls, not shown, may be substituted for these bronze bushings6| in order to take the pressure of the thread rolls.

Thus, it will be noted that the fluid motor 1 controls the speed of allthree thread rolls uniformly and the present construction of spindledrive through the chain of gears referred to eliminates all flexibledrives or complicated lever mechanism present in many machines. It willalso be seen by reference to Fig. 7 that the idler gears 35 and spindlegears 36 are so located as to permit radial shifting of the tool orthread rolls and their spindles without materially affecting the correctmeshing of the teeth of the gears 35 and 36, so that when the slides aremoved in toward the work, as hereinafter described, the teeth of thegears will remain in mesh and these gears are so constructed that thereis very little play between the teeth.

Where the motor is of sufiicient capacity, making it unnecessary to usethe change gears 3! and 32, this motor can be mounted at right angles toits present position in any suitable manner on the frame and a spur gearcarried by the shaft 24' may directly engage the gear 32 on the shaft33. In this construction, the worm 28 and worm gear 29, the shaft 30 andgear 3| would all be eliminated and a more direct drive obtained.

In order to shift the thread rolls 38 toward and from the work, a rotarycam 39 is provided having at its outer periphery, through degreesthereof, teeth 40 adapted to engage the worm 4| carried for shiftablemovement on the piston rod 22 attached to the piston IS.

The inner surface of this cam 39 is provided with three cam surfaces 42adapted to engage rollers 43 carried toward the outer ends of the slides44. These slides carry the roll spindles 8 which are adapted to beshifted toward the center when rolling a thread in a work piece. Theslides are mounted in slide-ways 46 and are provided with a frontsupport plate 45,

The cam 39 is adapted to rotate in the housing and is supported thereinby rollers 4'! engaging the outer periphery and these rollers arepositioned in line with the slide rollers 43 to provide for easy slidingrotary movement of the cam 39. Actuation of the piston I8 will cause theworm 4| on the piston rod 22 to rotate the cam 39.

As hereinbefcre mentioned, the piston rod has a predetermined stroke inaccordance with the setting of the stops 2|, thereby to rotate the camdisk 39 through any desired distance in order to shift the cam slides 44the correct distance for rolling accurate threads.

The three roller slides, being operated in umson, will cause an evenpressure on all three sides of the work and avoid crushing when it isdesired to roll threads on hollow parts and also assures a perfectroundness of the thread.

Suitable springs 59 and plungers 60 urge the slides outwardly so thatthe rollers 43 will always bear against the cam surfaces 42 and thesesprings and plungers are effective to move the slides in an outwarddirection when the cam 39 is rotated in a reverse direction.

In machining the cam 39, the three cam surfaces 42, as before stated,are machined identically in order to give a uniform action and movementto the slides 44 so that the three thread rolls will exert an evenpressure on the work.

In order to adjust the amount of movement of the thread rolls forobtaining a perfect pitch diameter on the work, a hand wheel 48 isprovided to rotate the worm 4| thus changing the position of the cam 39and, thereby, the position of the cam surfaces 42 relative to therollers 43 and, therefore, adjusting the movement of the slides 44.

The construction of this machine thus permits the rolling of threads ona work piece to the exact diameter required and also permits rolling ofthreads on work of different diameters as long as the number of threadsper inch and shape of threads are the same.

This machine may be adjusted to handle work from to diameter simply byadjusting the position of the worm 4| through the wheel 48, as beforeexplained. The stroke of the piston is controlled by the stops 2| andthese stops are adjusted by means of adjusting rods 49 supported on thegear box and provided with adjusting screws 50 at opposite sides of themachine and adapted to engage switch toggle elements 5| of the limitswitch |9 (see Fig. 8). This limit switch IS, in the present instance,is carried on a bracket -52 supported for movement with the piston rod-22. I

'--Wl '1e'n it is desired to roll fine thread-s, th stroke of'the'piston It can be reduced and time 'saved by-not opening the threadrolls more than is absolutelynecessary. To this enda stop screw T8 isthreaded in the end of the cylinder, as illustrated in Fig. 8, to limitthe stroke of the piston and piston 'rod 4| When it :is desiredtochange' from one thread toanother having a difierent pitch, it is only'n'ecessary to change the thread rolls 38 and ad- -*just 'the'fiowcont'rolva1ves '9 and w.

'The work is carried insuitable work chucks and adapted to be fed intothe machine in any fsuitable manner and, in the pre'se'nt instance,vvlien' the thre'adrolls contact the work, the work will freely rotateWithin the rolls. These roller bhuc'ksxand feeding means have not beenillustratedas they form no part of the present invention.

'Thefbase of the machine, as shown in Figs, 2 and =3, "is also providedwith the hydraulic oil valvegauge 53 for indicating the amount of oil inthe reservoir and at'the opposite side 'of the base an oil valve gauge54 is provided to indic'ate the' amount 'of 'cooling oilin itsreservoir.

The head stock 3 which carries the operating mechanism for the threadrolls has on its face the support 55 for the rolls 41. The handcontro'lle'd switch 24'for starting and stopping the machine may alsowbecarried by the head stock if 'd'esire'd. This-head stock likewisecarries the time delay valve 20 for controlling the time movement of'the'cam. Suitable; strainers 5B and 5! for filtering "the oil are provided,located in the base of the machine. The rotary control *gauge l6 and camcontrolpressure gauge I5 are "also located on the 'fa'ceof the headstock.

Suitable splash guards 58 are provided in front "of th thread rolls.

' In-the operation of the machine, the proper thread rolls "38 aresecured'to the spindles 8 and the adjusting handle 18 set to control theposition of the cam 39 for the'desired pitch diameter of the threadstobe rolled. The cam stops 2| are then set to limit the stroke of thepiston "for the desired movement of the cam slides 44. A piece of workis thenfed to the machine and the motor started to rotate the threadingrolls and the cam '39 to shift the slides 4'4 inwardly 'to'roll thedesired thread.

While this machine has been described as a thread rolling machine, bymerely substituting the proper tools for this work, it may also be 1used 'for burnishing outside surfaces and 'for grooving parts where itis desired that the grooves be "very accurate and smooth, or for otheropera- -tions wherethree rolls canbe applied with equal pressure on thework.

It isto be understood-that, by describing in detail herein anyparticular form, structure or arrangement, it is not intended to limitthe invention beyond the terms of the several claims or the requirementsof the prior art.

Having thus explained the nature of our said invention and described aWay of constructing and using the same, although without attempting toset forth all of the forms in which it may be made, or all of the modesof its .use, we claim:

1. A rolling machine having aplurality of radiallyshiftable slides,rotatable spindles carried bysaid slides, tool rolls carried by'saidspindles,

'a rotary cam for uniformly shiftingsaid slides,

meansincluding fiuidcontrolled means and gearing io'r actuating sai dcam, and independent inearis iri'c'l1iding "fluid oontrolled means andgearmgrcr rotating -saidx tool roll :spindl'es, the

gearing for ro'tating th'e spindles-oomprising a --spi'ntiles, "anotaryca'm for unifofmly "shifting said s'li'des, means including fluidcontrolled means and: gearing-nor actuating said cam-"and independentmeans -includin'g fluid controlled 'mean-s a'nd "ge'arih" 'for rotating"said tool roll spindles, the gearing-"for r otatin'g the spindleseumpnsm a gear carried by each tool spindle,

Of driVensiJiii' gearspone or each set in mesh with the driven-gear andthe otheri'in "mesh with "a *spind1e-gear,- and tlo'e -'gear-in'g forrotating the cam eornprisiii'g tethcar'rie'd by said cam and a fluidactuatedpiston-having. teeth meshing with -s'a id cam teeth.

nroumgmacninehavinga-pluraut of radially 'shiftable slide's; 'rota tablespir'idles carried by Said. slides, 17061 rolls Carried by saidSpindles, means for "rotatingsaid-spindles, a rot'a'ry' cam foruniformly shi'fti'h'g said' 'slides toward and from each other, -'areciprocating piston for-rotating the cam, and -mea'nsfor -ad-justingthe stroke -o'f the -'pisto'n-- and comprisin adjustable "steps, 'a"switch eon'troned by said st ps, and

.ie'ans 'f or adjusting'the' positionofsa'id stops.

4. rol'ling' machi'ne' liavi'ng a piu rant df radially "shiftableslides, rotatable spindles "carried by said slides, "tool r'olls -c edby said spindles, -1n'eaIis for rotating saidpindles, a rotary cam foruniformlysliif-ting -s'aid slide's toward and irom-each other, areciprocatin piston "for rotating' the cam,-a'n'd means fo'radjustingthe stroke of the piston --"and-comprising adjustable steps, "a *switchcontrolled by s'aidstops, and

, means for adjusting-the pos'itio'nof said stops,

Said switch stippoited fol' movement With the "piston.

- 5; Arollingmac'hine having aplura'lityof radial ly shiftable Slides,"rotatable spindles 'Calried by said slides, tool-rolls carrie'd'by saidspindles, means for "rotatin *said spindl'es, a rotary cam for uniformlyshifting said "slides "toward and from each othe'r, a reciprocatingpi's'toh fdr rotating the cam, and means for adjusting the stroke-er"the piston and comprisin adjustable stop's,-a switch controlled by saidstops, means for "adjusting the-position of said stops, and 'inea 'n'sfor "reducing "the -str'oke; 'o fthe piston.

6. A thread rolling-maritime 'liav'ing a-"plurali-ty of "radially shiftaible "slides, "rotataldle spindles carried by'said slides/toolrolls carried by said spindles, a rotary cam for uniformly shifting saidslides, means'for actuating"said cam, andmeans -for rotatipgthe'spindles'an'c'l comprising a driving gear, a driven gear, a pluralityof sets of driven ispur gears, 'one 'of'eac'h set in mesh with thedriven gear and the other in mesh with a --'d'rivin'g said driving"gear.

7. A thread rollingfriiacliine having a plurality 'ls i fe aet at n is ige a a comprising fiu'i'd operated means for rotating'the spindles andcomprising a driving gear, a driven gear, a plurality of sets of drivenspur gears, one of each set in mesh with the driven gear and the otherin mesh with a gear carried by each tool spindle, and means for drivingsaid driving gear.

8. A thread rolling machine having a plurality of radially shiftableslides, rotatable spindles carried by said slides, tool rolls carried bysaid spindles, a rotary cam for uniformly shifting said slides, meansfor actuating said cam, and means comprising fluid operated means forrotating the spindles and comprising a driving gear, a driven gear, aplurality of sets of driven spur gears, one of each set in mesh with thedriven gear and the other in mesh with a gear carried by each toolspindle, and means for driving said driving gear, said gearing includingchange gears.

9. A thread rolling machine having a plurality of radially shiftableslides, rotatable spindles carried by said slides, thread rolls carriedby said J spindles, a rotary cam for uniformly shifting said slides,fluid controlled means for actuating said cam and including areciprocating piston having worm teeth in engagement with similar teethcarried by the cam, means for adjusting the stroke of the piston, andmeans for rotating the thread roll spindles and comprising a drivinggear, a driven gear, a plurality of sets of driven spur gears, one ofeach set in mesh with the driven gear, and the other in mesh with a gearcarried by each thread roll spindle.

10. A rolling machine comprising a base and a gear box thereon, ahydraulic unit within said base, a hydraulic unit carried by said gearbox,

a plurality of radially shiftable slides, rotatable spindles carried bysaid slides, tool rolls carried by said spindles, a rotary cam foruniformly shifting said slides, all carried by said gear box, meanscontrolled by said hydraulic unit within the base for actuating saidrotary cam, and means controlled by said hydraulic unit carried by thegear box for rotating said tool roll spindles.

11. A rolling machine comprising a base and a gear box thereon, ahydraulic unit within said base, a hydraulic unit carried by said gearbox, a plurality of radially shiftable slides, rotatable spindlescarried by said slides, tool rolls carried by said spindles, a rotarycam for uniformly shifting said slides, all carried by said gear box,means controlled by said hydraulic unit within the base for actuatingsaid rotary cam, means controlled by said hydraulic unit carried by thegear box for rotating said tool roll spindles, and means for adjustingthe position of said cam.

12. A thread rolling machine having a plurality of radially shiftableslides, rotatable spindles carcied by said slides, thread rolls carriedby said spindles, a rotary cam for uniformly shifting said slides, fluidcontrolled means for actuating said cam and including a reciprocatingpiston having worm teeth in engagement with similar teeth carried by thecam, means for adjusting the stroke of the piston, means for rotatingthe thread roll spindles and comprising a driving gear, a driven gear, aplurality of sets of driven spur gears, one of each set in mesh with thedriven gear and the other in mesh with a gear carried by each threadroll spindle, and adjustable means automatically operative for limitingthe movement of said cam.

13. A thread rolling machine having a plurality of radially shiftableslides, rotatable spindles carried by said slides, threading rollscarried by said spindles, a rotary cam in direct engagement with saidslides for uniformly shifting them, a hydraullc unit for oscillatingsaid cam and embodying a reciprocating piston in direct engagement withsaid cam and fluid control valves for said cam, a hydraulic unit forrotating said thread roll spindles and embodying a fluid control valvefor controlling the speed of the thread rolls.

14. A thread rolling machine having a plurality of radially shiftableslides, rotatable spindles carried by said slides, threading rollscarried by said spindles, a rotary cam in direct engagement with saidslides for uniformly shifting them, a hydraulic unit for oscillatingsaid cam and embodyin a reciprocating piston in direct engagement withsaid cam and fluid control valves including a time delay valve for saidcam, a hydraulic unit for rotating said thread roll spindles andembodying a fluid control valve for controlling the speed of the threadrolls.

15. A thread rolling machine having a plurality of radially shiftableslides, rotatable spindles carried by said slides, thread rolls carriedby said spindles, a hydraulic unit for rotating said spindies andembodying means for controlling the speed of said spindles, a rotary camfor uniformly shifting said slides toward and from each other, areciprocating piston for rotating said cam, a hydraulic unit foroperating said piston, means for controlling the stroke of the pistonand thereby the movement of the cam, and a time delay valve for saidcam.

16. A thread rolling machine having a plurality of radially shiftableslides, rotatable spindles carried by said slides, threading rollscarried by said spindles, a rotary cam in direct engagement with saidslides for uniformly shifting them, a hydraulic unit for oscillatingsaid :cam and embodying a reciprocating piston in direct engagement withsaid cam, a flow control valve for said cam in communication with afour-way valve located between said flow control valve and said piston,a time delay valve for said cam, and a hydraulic unit for rotating saidthread roll spindles and likewise embodying a flow control valve forcontrolling the speed of the thread rolls.

1?. A tool rolling machine having a plurality of radially shiftableslides, rotatable spindles carried by said slides, tool rolls carried bysaid spindles, a rotary cam for uniformly shifting said slides, fluidcontrolled means for actuating said cam and including a reciprocatingpiston having a rod with worm teeth in engagement with similar teethcarried by the cam, an adjusting member fastened to said piston torotate the same and the worm teeth and thereby readjust the position ofthe rotary cam relative to the shiftable slides without longitudinallyshifting the piston and the worm teeth, and means for rotating the toolroll spindles and comprising a driving gear, a driven gear, a pluralityof sets of driven gears, one of each set in mesh with the driven gear,and the other in mesh with a gear carried by each thread roll spindle.

18. A thread rolling machine having a plurality of radially shiftableslides, rotatable spindles carried by said slides, thread rolls carriedby said spindles, a hydraulic unit for rotating said spindles andembodying means for controlling the speed of said spindles, a rotary camfor uniformly shifting said slides toward and from each other, areciprocatin piston for rotating said cam, a hydraulic unit foroperating said piston, means for controlling the stroke of the pistonand thereby the movement of the cam, time valve means for said cam, saidpiston having a rod with worm teeth thereon engaging gear teeth on therotary cam, and an adjusting member fastened to said Number piston torotate the same and thereby position 1,930,059 the rotary cam relativeto the slides. 2,098,213 ALFRED E. DRISSNER. 2,130,069 WILLIAM J. HOGG.5 2,252,130

REFERENCES CITED The following referenices are of record in the Numberfile of this patent: 1,561 UNITED STATES PATENTS 10 332 Number Name Date25 314 280,723 Davis July 3, 1883 4,010 1,039,992 Muncaster Oct. 1, 19121,874,995 Heinauer Aug. 30, 1932 15 Name I Date Muller f Oct. 10, 1933Benedek Nov. 9, 1937 Criley Sept. 13, 1938 Lamprecht Aug. 12, 1941FOREIGN PATENTS Country Date Great Britain June 27, 1860 Great BritainOct. 10, 1893 Great Britain Jan. 11, 1895 Great Britain Nov. 24, 1902France Apr. 19, 1905

